Shared photo stream not working

I used to run a shared photostream from both my iPhone and iPad. I recently changed phone handset but have kept my iPad. I have tried to add photos to my shared Photostream since this and for some reason, despite showing as on the stream on the device itself, they do not go to any other members. Similarly, other people can still post photos and they are received by others but do not go onto my iPad. I don't want to delete this but it looks like it needs a nudge or something. Any advice would be greatly appreciated.

Thanks

Chris